Drill bushing device



Aug. 6, 1940. F. H. ROHR DRILL BUSHING DEVICE Fil'ed March '7, 1938 ATTORNEY.

Patented Aug. 6, 1940 1 DRILL B snnsG DEVICE Frederick H. Rohr, Mission Beach, Calif., assignor of one-half to The Ryan Aeronautical 00., San .Diego, Calif., a corporation of California Application March 7, 1938; Serial No. 194,422

' Claims. (C1. 77-55)- My invention relates to a drill bushing device to be used in connection with jigs or drill forms particularly adapted for drilling plate material and the objects of my invention are:

First, to provide a drill bushing means of this class which greatly facilitates the drilling of holes with the use of jigs or hole drilling forms to be used in connection with electric drill machine or the like;

Second, to provide a drill bushing device of this class in which the bushing is yieldably held so that it may be easily and quickly inserted in the hole in the jig'or drill form and will yieldto per-' the wear on the bushing which fits into the jig v or form will have a minimum of wear; and

Sixth, to provide a device of this class which is very simple and economical'of construction,

easy to operate, easy to install for use, eflicient in its action, and which will not readily deteriorate or get outof order.

With these and other objects in view as will appear hereinafter, my invention consists of certain novel features of construction, combination, and arrangements of parts and portions as will be hereinafter described in detail and be particularly set forth in the appended claims, refer-' ence being had to the accompanying drawing, and to the characters of reference thereon which form a part of this application in which:

Figure 1 is a side elevational view of my'drill bushing device shown installed on an electric drill shown in dotted lines and shown in connection with a jig or drill form and'the plate material to be drilled shown in dash lines; Fig. 2 is a side 'elevational view of the device'alone at right angles to that of Fig. 1 and showing the spring slightly broken away and in sections to facilitate the illustration; Fig. -"3 is a sectional view from the line 33 of Fig. 2; Fig. 4 an end view of the device taken fromthe line 44 of Fig. 1; I

Similar characters of reference refer to similar parts and portions throughout the several views of the drawing:

The bushing member I, spring 2, clamp support 3, and clamp bolt 4, constitute the principal parts and portions of my drill bushing, device.

The bushing member I is a cylindricalmember provided with a drill .guiding hole In. therethrough. It is provided with a spiral groove lb 5 therein adapted -to receive the convolutions of the one end of the spring 2 shown best in Figs. 2 and 3 of the drawing. It is provided with an enlarged shoulder portion lc against which one end of the spring 2 is supported. This enlarged l0 portion is beveled at its forward side at Id and it is provided with an extended bushing portion. le which is adapted to fit into the holes prepared in the jig or drill form J shown by dash lines in Figs. 1 and 3 of the drawing. 15

The spring 2 is sufliciently rigid to suitably support the bushing member I; that is, sufliciently yieldable to permit the drill to be pressed into the material to bedrilled and also to permit the ready placing ofthe portion le into the hole 0 in the jig for starting and guiding the drill. The opposite end of the spring 2 is supported on a lug 3a by'means of spiral grove 3b in the outer side of said lug. This lug is provided with a bore 30 for guiding the drill and through which 25 the drill is operated. It will be noted that the spring is of suflicient length to permit considerable space between the members land 3a so that holes may be drilled through material of considerable thickness if desired. This bushing 3a 3 is supported preferably in integral relation witha casing portion 312' which is preferably thin plate and formed to fit around the shank S and the drill coupling C as shown best in Fig. 1 of the drawing and the drill D passes through the bores la and 3c in the bushing and lug as shown best in Fig. 1 of the drawing.

This member 3d is provided on its larger end with strap portions 3e which are provided with angular lug portions 3f through which is mounted d the clamp bolt 4 which is provided with a nut 4a thus providing means for rigidly clamping drawing.- Then by grasping the handle of the drill, the operator places the bushing portion le into the hole in the jig J which hasalready been placed in proper position in connection with the material M ready for drilling the holes in proper position in the material M. Then the 55 hole is drilled by means of the drill D guided by the bushing I and lug 3a., the spring 2 yielding for both positioning the portion is in the hole and also for feeding the drill into the material, the spring 2 being sufficiently strong so that it holds. the bushing I so that it may be readily placed in the hole in the jig J.

Though I have shown and described a particular construction, combination, and arrangement of parts and portions, I do not wish to be limited to this particular construction, combination, and arrangement, but desire to include the combination and arrangement substantially as set forth in the appended claims.

' Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A drill bushing device of the class described consisting of a supporting clamp member provided with an integral drill guiding bushing with a drill guiding bore therein, a spring secured over said bushing and supported thereby and extending therefrom, a drill bushing secured in the extended end of said spring with a drill bore in substantial alignment with the drill bore in said drill guiding bushing and means for clamping said support in position on an electric drill casing shank.

2. A drill bushing device of the class described consisting of a supporting clamp member provided with an integral drill guiding bushing with a drill guiding bore therein, a spring secured over said bushing and supported thereby and extending therefrom, a drill bushing secured in the extended end of said spring with a drill bore in substantial alignment with the-drill bore in said 'drill guiding bushing, means for clamping said support in position on an electric drill casing shank, said drill bushing provided with a reduced extended bushing portion adapted to fit the holes of a Jig.

3. A drill bushing device of the class described consisting of a-drill bushing, a clamp like support for said drill bushing in spaced relation therewith, yieldable means connecting and wholly supporting said bushing with its support, both said bushing and said support provided with bores for guiding and supporting the drill and means for clamping said support in position on an electric drill casing shank.

4. A drill bushing device of the class described consisting of a clamp support provided with an extended reduced and axially aligned lug portion provided with a drill guiding bore therein and provided on its outer side with a spiral spring supporting groove, a spring mounted thereon with its end convolutions mounted in said groove, a drill bushing provided with spiral grooves adapted to receive the extended end of said spring for yieldably and flexibly supporting said bushing, said bushing provided with a drill guiding bore therethrough. i

5. A drill bushing device of the class described consisting of a clamp support provided with an extended reduced and axially aligned lug portion provided with a drill guiding bore therein and provided on its outer side with a spiral spring supporting groove, a spring mounted thereon FREDERICK H. ROHR. 

